Cummins/Onan 2100 Series — Testing the Float Switch Assembly
Maintenance
For the Cummins/Onan 2100 Series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFGB, Cummins/Onan DFGE, Cummins/Onan DFLB, Cummins/Onan DFLC, Cummins/Onan DFLE
Procedure
- Remove fuel pump control cover; disconnect wiring jack.
- Unscrew assembly from top of the day tank.
- With ohmmeter test continuity between each pair of colored leads.
- Hold assembly vertical; all readings should be zero.
- Lift each float to 1/8 inch (3 mm) below the C-clip stop.
- Test continuity; all readings should be infinity.
- Replace assembly if any switch fails.
- Use pipe thread sealant when replacing.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Lift float 1/8 inch (3 mm) below C-clip stop
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DFGB →, Cummins/Onan DFGE →, Cummins/Onan DFLB →, Cummins/Onan DFLC →, Cummins/Onan DFLE →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.